ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
54 lines • 7.85 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { Pipe } from '@angular/core';
import { isNumberFinite, toDecimal } from 'ng-zorro-antd/core/util';
export class NzBytesPipe {
transform(input, decimal = 0, from = 'B', to) {
if (!(isNumberFinite(input) && isNumberFinite(decimal) && decimal % 1 === 0 && decimal >= 0)) {
return input;
}
let bytes = input;
let unit = from;
while (unit !== 'B') {
bytes *= 1024;
unit = NzBytesPipe.formats[unit].prev;
}
if (to) {
const format = NzBytesPipe.formats[to];
const result = toDecimal(NzBytesPipe.calculateResult(format, bytes), decimal);
return NzBytesPipe.formatResult(result, to);
}
for (const key in NzBytesPipe.formats) {
if (NzBytesPipe.formats.hasOwnProperty(key)) {
const format = NzBytesPipe.formats[key];
if (bytes < format.max) {
const result = toDecimal(NzBytesPipe.calculateResult(format, bytes), decimal);
return NzBytesPipe.formatResult(result, key);
}
}
}
}
static formatResult(result, unit) {
return `${result} ${unit}`;
}
static calculateResult(format, bytes) {
const prev = format.prev ? NzBytesPipe.formats[format.prev] : undefined;
return prev ? bytes / prev.max : bytes;
}
}
NzBytesPipe.formats = {
B: { max: 1024 },
kB: { max: Math.pow(1024, 2), prev: 'B' },
KB: { max: Math.pow(1024, 2), prev: 'B' },
MB: { max: Math.pow(1024, 3), prev: 'kB' },
GB: { max: Math.pow(1024, 4), prev: 'MB' },
TB: { max: Number.MAX_SAFE_INTEGER, prev: 'GB' }
};
NzBytesPipe.decorators = [
{ type: Pipe, args: [{
name: 'nzBytes'
},] }
];
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